Universal indicator



Oct. 10. 1-944.

F. v. WALTZ UNIVERSAL INDICATOR Original Filed July 31, 1941 z Wm W m w Wv M Patentecl Oct. 10, 1944 UNITED STATES PATENT OFFICE 7 2,360,181

UNIVERSAL INDICATOR Foster V. Waltz, Toledo, Ohio Original application July -31, 1941, Serial No.

1942, Serial No. 451,559

6 Claims.

This invention relates to universalindicatorsriety of different kinds of metals. Different metals, being of different hardnesses, require different cutting or drilling speeds and these speeds.

are again differentiated between the sizes of drills and other tools with which the metalis worked. It is necessary for the machine tool operator to set the speed of operationof the machine tool both for the size of the tool being driven and the type of metal or material which is being operated upon. This setting requires,

either frequent reference to guide charts or a setting from memory, which may or may not be accurate and correct for the material and the size of the tool. a

It may also be desirable to afford an indication of the speed of a tool or other driven object in different terms which should be easily selectable for reference, i. e., the speed may be shown in revolutions per minute, linear feet per minute.

cycles, inches of feed per minute or any oneof a plurality of other terms or ratios.

It is an object of this invention to provide an indicator for use with speed changing transmission devices which has a plurality of scales or groups of indicia so that the speed of a machine tool can be controlled by reference directly to the indicating means where the speed can be translated into a plurality of different, terms and ratios.

It is another object of this inventionto pro.-

vide a universal indicator which can be mounted in any position relative to the transmission device with which it is adapted to be used.

More specific objects and advantages are apparent from the description, in which reference is had to the accompanying drawing illustrating a preferred form of indicator embodying the invention.

In the drawing:

Fig. I is a side elevational view of a, drill press equipped with an indicator embodying the invention.

Divided and this application July 20,

Fig. II is a greatly enlarged view, in elevation, of an indicator embodying the invention, certainparts being broken away to more clearly show details of construction.

Fig. III is a vertical sectional view, taken substantially on the line III-III of Fig. II.

This specific drawing and the specific descriptionthat follows merely disclose and illustrate the invention and are not intended to impose limitations upon the claims.

A drill press, comprising an upright column l0, base I I, worktable l2 and head [3, is equipped with a driving motor l4 and a belt driven handfeed tool-holding spindle It. A variable speed transmission device I6. is bolted to the top of the frame I 3 and has an upright jackshaft I? on which is journaled a dual sheave. composite pulley IS. A variable speed transmission suitable' for such use is disclosed in my above-mentioned copendingapplication Serial No. 404,867. The transmission I6 is controlled by a handwheel I9 which translates the composite pulley l8 along the line between the motor I4 and spindle IS. A belt 2E1 is engaged in a motor pulley 2| which is secured on the shaft of the motor [4 and one sheave of the composite pulley l8. A second belt 22 is. engaged in the other sheave .of the compositepulley l8 and in a spindle pulley 2-3 which is secured on the upper end of the tool-holding spindle t5. By rotating the handwheel I 9,, the jackshaft I! and the composite pulley thereon are moved away from or toward the motor shaft or spindle which causes the diameters of "the sheaves of the composite pulley 18 to change, thereby changing the resulting driven-speed of the spindle l5.

Aninner wire 24 (see also Fig. II) of a Bowden cable. 25: is clamped to a movable block 26 in the transmission I6 in which the jackshaft ii is secured. The sheath of the Bowden cable is clamped to the stationary frame of the transmission I6. The opposite end of the sheath of the Bowden cable 25 is clamped in a socketed bracket 2? which (in the. embodiment shown) is secured to the side of the frame t3 of the drill press. 'The bracket 21 is provided with means for mountingand may, therefore, be attached to a bench, a wall, a standard, or in any other position where it is most easily seen by the ma.- chine tool operator. A tube 28,. which. has 'a shoulder 29 at one of its ends, is mounted in the bracket 21 by means of a set screwtfl threaded transversely through one of 'the walls" of the bracket 2'! and into an annular groove 3! which is cut in the outer surface of the shoulder of the disk-like indicator 32 is visible. Several series of indicia 36 are marked on the exterior of the tube 23, one of them being inscribed on one edge of each of the apertures 35. Each one of these sets of indicia 36 is in different terms or ratios depending upon the information which it is desired shall be afforded.

In the embodiment of the invention shown in Fig. II the two sets of indicia illustrated correspond to drill sizes for drilling in cast iron and in brass. Others of the apertures 35 which are not visible in Fig. II would carry the same drill sizes so located as to correspond to correct drilling speeds for high and low carbon content steel, aluminum, copper, nickel, etc.

A knurled knob 31 is fastened on the right end of the tube 28 so that the tube can be rotated in the bracket 21 to turn that one of the sets of indicia 36 corresponding to the metal to be worked into reading position. With the correct scale in position, for example, the cast iron scale, if the hole to be drilled has a diameter of one inch, the handwheel l9, which con trols the transmission device I6, is turned until the indicator is in the position shown in Fig. II, in which case the transmission device I5 is so adjusted as to give the tool-holding spindle I5 the correct speed for drilling cast iron with a one inch drill. Similarly, if the material to be drilled were brass, the tube 28 would be rotated upwardly from the position shown in Fig. II until that aperture 35 corresponding to brass was in position for reading. Since brass is a softer metal than cast iron, the drill speeds should be higher than for the harder metal and, therefore, the drill size indicia is marked on the brass scale further to the left than on the cast iron scale. Consequently, in order to set the transmission device 16 properly, the handwheel 19 would be rotated, moving the shaft H to the right in Fig. I and the indicator 32 to the left in Figs. I and II until it registered with the proper drill size in the brass scale.

If it is desired that the indication be given in terms or ratios other than those scribed onthe tube 28, such tube easily may be replaced with another tube bearing such terms or ratios.

The embodiment of the invention that has been disclosed may be modified to meet various requirements.

Having described the invention, I claim:

I. An indicator for a variable speed transmission having a member movable in proportion to changes in speed comprising, in combination, a tubular member, means for mounting said tubular member, said tubular member having a plurality of longitudinal viewing apertures, a scale associated with each of said apertures and an index cooperable with each of said scales and movable in response to movement of said movable member to indicate changes, in speed in terms of each of said scales.

2. An indicator for a variable speed transmisconnected to said movable member and slidable within said tubular member.

3. An indicator for use with a variable condition changing mechanism having a member movable in proportion to changes in such condition,

"comprising, in combination, a bracket, a tubular member rotatably mounted in said bracket, said tubular member having a plurality of longitudinal viewing apertures in the wall thereof, a scale associated with each of said apertures, each of said scales comprising indicia of different terms and ratios, and a, single index member longitudinally slidable within said tubular member and directly connected to said movable member of said condition. changing mechanism.

4. An indicator for a variable speed transmission employed with a material working machine,

said transmission having a member movable in proportion to changes in speed comprising, in combination, a tubular member, 'means for mounting said tubular member, said tubular member having a plurality of longitudinal viewing apertures, a scale associated with each of said apertures and an index cooperable with each of said scales and movable in response to movement of said movable member to indicate changes in speed in terms of each of'said scales, each of said scales representing a different type of mate-.

' rial to be worked, each of said scales comprising a series of tool size indicia.

5. An indicating device for use with variable speed transmission mechanisms, said indicating device comprising, in combination, a plurality.

of scales each bearing indicia marked to designate a series of diameters of holes to be drilled, the indicia on each scale being spaced in accordance with the machining characteristics of a material to be drilled, and the scale being labeled to designate material having machining ,chare acteristics according to such spacing, aniindex, means for so connecting said indexto; variable speedtransmission mechanism that said index is automatically positioned in accordance with the speed for which the variable speed transmission mechanism is set, and means. for selectively bringing said scales into visible cooperative relation with said index.

6. An indicating device for use with variable speed transmission mechanisms, said indicating device comprising, in combination, a plurality of scales each bearing indicia marked to designate a series of diameters of holes to be drilled, theindicia on each scale being spaced in accordance with the machining characteristics of a material to be drilled, and the scale being labeled to designate material having machining characteristics according to such spacing, an index, means for so connecting said index to variable speed transmission mechanism that said index is automatically positioned in accordance with the speed for which the variable speed transmission mechanism is set, and means for selectively bringing said scales into visible cooperative relation with said index and simultaneously bringing, the labeling of the selected scales into convenient visibility.

' FOSTER v. w L'rz. 

